Download Energy_Presentation

Energy
By: S. S.
Unit 4 - Objectives
•
•
•
•
The relationship between work and energy is that when work is done on an object,
energy is transferred to that object.
Kinetic energy is related to mass and speed because that is the formula to calculate
an object’s kinetic energy. Also, the kinetic energy of any moving object depends
upon the object’s mass and velocity/speed.
Potential energy is related to an object’s position because the higher an object, the
higher its potential energy.
This is a table that states the major forms of energy and how each is produced:
major
forms of
energy
Kinetic
Energy
Potential
Energy
Gravitational
Potential
Energy
Elastic
Potential
Energy
Mechanical
Energy
Thermal
Energy
Chemical
Energy
Electrical
Energy
Electromagnetic
Energy
Nuclear
Energy
how the
energy is
produced
the
object’s
mass
and
velocity
energy that
is stored
as a result
of position
or shape
the object’s
mass and
acceleration
due to gravity
an object
being
stretched or
compressed
energy
associated
with the
motion and
position of
everyday
objects
(Potential +
Kinetic
Energy)
the total
Potential
Energy and
Kinetic
Energy of
microscopic
particles in
an object
energy
stored in
chemical
bonds
energy
associated
with
electric
charges
a form of energy
that travels
through space in
the form of waves
energy
stored
in
atoms
Unit 4-2 Objectives
•
•
•
•
When energy is converted from one form to another , the total energy remains
unchanged. This is called the law of conservation of energy. Energy can be converted
from one form to another, but the energy that is present at the beginning of a process
is the same as the amount of energy at the end of the process.
The law of conservation states that energy cannot be created or destroyed. For
example, if you are roller skating and you stop skating, you will eventually stop
moving. When you are skating you have kinetic energy, but when you stop skating
the kinetic energy goes between the friction in the wheels and the ground. The work
done by friction changes the kinetic energy to thermal energy.
Energy is conserved in conversions between kinetic energy and potential energy
because the gravitational potential energy of an object is converted to kinetic energy
of motion as the object falls.
The relationship between energy and mass is that the more mass, the higher the
kinetic energy because the formula for kinetic energy is ½ mass x velocity squared.
Unit 4-3 Objectives
•
•
Here are some of the major nonrenewable and renewable sources of energy. Some
examples of nonrenewable resources are oil, gasoline, natural gas, coal, and uranium.
Some examples of renewable resources are solar, wind, hydro electric, geothermal,
biomass, and nuclear fusion.
Here are the benefits and draw backs of different energy sources:
energy sources
draw backs
hydroelectric
•no pollution
•low cost
•environmental impact
(disrupts flow of fish and
other wild life)
•we don’t have enough rivers
solar
•no pollution
•low cost
•must have sun
geothermal
•no pollution
•not very accessible
•cheap
•renewable (easily grown)
•pollution
hydrogen fuel cell
•no pollution
•not as efficient
wind turbines
•low cost
•no pollution
•renewable
•needs wind
•takes up space
biomass
•
benefits
Energy resources can be conserved if you try to use more renewable resources than
nonrenewable resources.
Ways to Conserve Energy
• don’t plug too many cords in one plug
• unplug things that you are not using
• turn off water and lights when you are not
using them
• recycle
• use rechargeable things
• use windmills instead of fossil fuels
• ride a bike instead of driving a car